Conduit-bushing wrench



v June 1927' w. H. VIBBER CONDUIT BUSHING WRENCH Filed Aug. 25 1926Patented June 21, 1927.

'3 i ii 1: n "3: 1111's WHEELER H. V enna, :onnnw nonnortconnnorrcur.

Application filed August 25, 1926. Serial No. 131,332.

My invention relates to an improved wrench for applying and removingconduitbushings, as the flanged internally-threaded caps extensivelyused on the conduits of electrical installations are Commonly termed,the object being to provide a simple, convenient, timeand-labor-savingtool, whereby such bushings may be readily applied and removed,particularly when located within boxes or cabinets of whateverdescription and purpose.

\Vith these ends in view, my invention consists in a conduit-bushingwrench having a guide-pin substantially corresponding to the internaldiametpr of the conduit and provided at its inner end with one or moreinternally-tapered grippingfingers extending alongside it and offsettingfrom it by substantially the thickness of the conduit wall.

My invention further consists ina conduit-bushing wrench characterizedas above and having certain other details as will be hereinafterdescribed and particularly pointed out in the claims.

In the accompanying drawings:

Fig. 1 is a view in elevation of one form which my improvedconduit-bushing wrenchmay assume;

Fig. 2 is an underside view thereof;

Fig. 3 is a view thereof in elevation, taken at a right angle to theposition in which the wrench is shown in Fig. 1;

Fig. 1 is a view in broken longitudinal section on the line t-1 of Fig.1; and

Fig. 5 is a broken View, showing the use of my improved wrench inturning a conduit-bushing located within a box.

In carrying out my invention as herein shown, my improvedconduit-bushing wrench is formed with a guide-pin substantiallycorresponding to the internal diameter of the conduit 11 and thereforeto the internal diameter of any standard conduit-bushing, such as thebushing 12. At its inner end or base, the said guide-pin is enlarged, asshown, to form an integral head 13, having two oppositely-locatedintegral grippingfingers 1 1 which extend outwardly alongside of thesaid pin, with the axis whereof their axes are substantially parallel.The inner edges of the said fingers are tapered as at 15 and they areoffset from the pin 10 by a space 16 wide enough to permit them to passover and embrace and grip any standard bushing, whether the exteriorface thereof is ribbed or otherwise roughened or not.

As herein shown, the head 13 is formed with a concentric socket 17receiving the fiattened ball-like terminal 18 of a handle-shank 19carrying a cross-piece 20 at its outer end, the said terminal 18 beingperforated and counterbored at its ends, as at 21, for the reception ofav pin 22 in the head 13, where by a universal joint is formed betweenthe handle-shank 19 and the head 13 forming the wrench proper.

When the wrench is so mounted upon a handle, it becomes easy to use itfor applying and removing bushings located within a box or cabinet ofany description. In Fig. 5 it is shown as entered into a box 23.

In the practical use of my improved wrench, it is common to slip thebushing over the guide-pin of the wrench and then insert the guide-pininto the conduit into which it is shoved until the bushing is broughtinto engagement with the threads of the conduit, at which time, if notbefore, the bushing wi ll be firmly gripped by the fingers of thewrench, which will now be rotated until the bushing has been turnedhome. On the other hand, to remove the bushing, the guide-pin isinserted through the bushing into the conduit until the gripping-fingersof the wrench have gripped the bushing with sufficient firmness topermit it to be rotated and so backed off the conduit.

My improved wrench will be found of particular convenience inmanipulating conduit-bushings within boxes and cabinets, which in manycases are difficult of access on account of the limited room which theyoffer for the introduction of the'hands of the installer.

I claim: 1

1. A conduit-bushing wrench, comprising a guide-pin provided at its basewith aninternally-tapered gripping-finger extending forwardly alongsideit but offset from it by substantially the thickness of the bushing.

2. A conduit-bushing wrench, comprising a guide-pin provided at its basewith internally-tapered oppositely-located gripping-fingers extendingforwardly alongside it but offset from it by substantially thethickness, of the bushing.

3. A conduit-bushing wrench, comprising the thickness of the bushing, achambered 10 head for the said pin and fingers, and a handle-shankentered into the chamber of the head and having substantialuniversaljoint connection therewith.

In testimony whereof, Ihave signed this 15 specification.

WHEELER H. VIBBER.

